Yes, absolutely, that's how you get the appearance of a diagonal sashing. I believe Cathy's is the same, only she didn't centre any centre stripes. This i'll try your way and do it on foundation fabric, rather than having to get a co-worker to tear all my paper off for me like Cathy does lol lol lol I find it amazing that two quilts so similar can look so absolutely different and very striking. :) Oh, i think this is the pattern on quiltville, oh i might have to try this too lol
http://quiltville.com/stringquiltingprimer.shtml